A 2 mW laser operates at a wavelength of 500 nm .The number of photons that will be emitted per second is: [Given Plank's constant h= 6.6\times 10^{-34}Js,speed of light c=3.0\times 10^{8}m/s ]

 

 

 

 

 

 

  • Option 1)

    5\times 10^{15}

  • Option 2)

    1.5\times 10^{16}

  • Option 3)

    2\times 10^{16}

  • Option 4)

    1\times 10^{16}

Answers (1)

P=\frac{n.hc}{\lambda }

n=\frac{p\lambda }{hc}

n=\frac{2\times 10^{-3}\times 500\times 10^{-9}}{6.6\times 10^{-34}\times 3\times 10^{8}}

 

n=1.5\times 10^{16}


Option 1)

5\times 10^{15}

Option 2)

1.5\times 10^{16}

Option 3)

2\times 10^{16}

Option 4)

1\times 10^{16}

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